78 lines, 1 of them comments · 1,037 tokens, written in 12 seconds for $0.055

 1  let particles = [];
 2  const NUM = 1200;
 3  let zOff = 0;
 4  let hueBase;
 5  
 6  function setup() {
 7    createCanvas(windowWidth, windowHeight);
 8    colorMode(HSB, 360, 100, 100, 100);
 9    background(10);
10    hueBase = random(360);
11    for (let i = 0; i < NUM; i++) {
12      particles.push(makeParticle());
13    }
14  }
15  
16  function makeParticle() {
17    return {
18      pos: createVector(random(width), random(height)),
19      prev: null,
20      speed: random(0.5, 2.5),
21      hueShift: random(-30, 30),
22      life: random(100, 400)
23    };
24  }
25  
26  function draw() {
27    // translucent fade for trails
28    noStroke();
29    fill(10, 10, 4, 4);
30    rect(0, 0, width, height);
31  
32    const scale = 0.0022;
33    for (let p of particles) {
34      const n = noise(p.pos.x * scale, p.pos.y * scale, zOff);
35      const angle = n * TWO_PI * 4;
36      const vx = cos(angle) * p.speed;
37      const vy = sin(angle) * p.speed;
38  
39      p.prev = p.pos.copy();
40      p.pos.x += vx;
41      p.pos.y += vy;
42      p.life--;
43  
44      const h = (hueBase + n * 120 + p.hueShift + 360) % 360;
45      stroke(h, 70, 95, 25);
46      strokeWeight(1.2);
47      line(p.prev.x, p.prev.y, p.pos.x, p.pos.y);
48  
49      if (
50        p.life <= 0 ||
51        p.pos.x < -10 || p.pos.x > width + 10 ||
52        p.pos.y < -10 || p.pos.y > height + 10
53      ) {
54        const np = makeParticle();
55        p.pos = np.pos;
56        p.speed = np.speed;
57        p.hueShift = np.hueShift;
58        p.life = np.life;
59      }
60    }
61  
62    zOff += 0.0015;
63  }
64  
65  function mousePressed() {
66    noiseSeed(floor(random(100000)));
67    hueBase = random(360);
68    background(10);
69    particles = [];
70    for (let i = 0; i < NUM; i++) {
71      particles.push(makeParticle());
72    }
73  }
74  
75  function windowResized() {
76    resizeCanvas(windowWidth, windowHeight);
77    background(10);
78  }